package com.ddlaw.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.ddlaw.entity.TUsers;



public class LoginFilter implements Filter{
	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}
	
	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		HttpSession session = req.getSession(true);
		// 从session里取的用户名信息
		TUsers user = (TUsers) session.getAttribute("user");
		// 判断如果没有取到用户信息,就跳转到登陆页面
		if(user == null){
			// 跳转到登陆页面
			res.sendRedirect("http://" + req.getHeader("Host") + req.getContextPath() + "/user/login");
		}else {
			// 已经登陆,继续此次请求
			chain.doFilter(request, response);
		}
	}
	
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
		
	}
}

